Add a local stack for ERC20 watcher (#80)

* Add a healthcheck for ipld-eth-server

* Update ipld-eth-server ports in mobymask watcher config

* Update clique period to 5s in geth-foundry config

* Add a stack for erc20 watcher

* Add a demo for erc20 watcher

* Upgrade watcher-ts version

* Update instructions

* Pass option to pull while setting up repos

container-build/cerc-watcher-erc20/Dockerfile

@@ -0,0 +1,13 @@
+FROM node:16.17.1-alpine3.16
+
+RUN apk --update --no-cache add git python3 alpine-sdk
+
+WORKDIR /app
+
+COPY . .
+
+RUN echo "Building watcher-ts" && \
+    git checkout v0.2.19 && \
+    yarn && yarn build
+
+WORKDIR /app/packages/erc20-watcher